I was thinking about using 2nd hand tyres for a 1750 # car used mostly on concrete / tarmac / slick dirt. short run stuff
23.5 > 24.5 .... SD 23 > SD33
Yes / No ,
I really just don't want to spend gob fulls of money, ... I have very deep pockets and short arms lol.

The Hoosier tire site will give you plenty of info if you have the tire model # available.

The Hoosier tires we run on dirt are pretty hard… I think they have a durometer reading in the mid-50's IIRC. The rubber compounds vary from a dirt to an asphalt tire… lots of different tech going on there. A call to your Hoosier distributor should also help you a bit.

Last place in the B-main is better than anyplace in the grandstands...